F3 code--oven doesn't heat

The oven on my range has been inoperable since I moved in; when I try to set the oven the temperature display does not move and after a few minutes there is loud beeping and F3 appears in the display. I tried as suggested in manual to cut power off at the circuit breaker, but I dare not attempt to disconnect power by pulling out the range. Would that usually work or is it likely to need service and approximately how much will that cost? Thanks!